diff options
| author | Sergey Sharybin <sergey.vfx@gmail.com> | 2017-12-15 18:22:54 +0300 |
|---|---|---|
| committer | Sergey Sharybin <sergey.vfx@gmail.com> | 2017-12-15 18:54:28 +0300 |
| commit | 412de222f8711893f7ed66630b6b8a1473810ab2 (patch) | |
| tree | bc16800b475eb5d2891c9f387f2b9e287c4a869c /source/blender/blenlib/BLI_math_bits.h | |
| parent | 02ec0b53df0a966048500e659389dbb987847c49 (diff) | |
Math utils: Add bit scan operations
Diffstat (limited to 'source/blender/blenlib/BLI_math_bits.h')
| -rw-r--r-- | source/blender/blenlib/BLI_math_bits.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_math_bits.h b/source/blender/blenlib/BLI_math_bits.h index 40a1d84b0e1..248b615e3f8 100644 --- a/source/blender/blenlib/BLI_math_bits.h +++ b/source/blender/blenlib/BLI_math_bits.h @@ -31,6 +31,14 @@ extern "C" { #include "BLI_math_inline.h" +/* Search the value from LSB to MSB for a set bit. Returns index of this bit. */ +MINLINE int bitscan_forward_i(int a); +MINLINE unsigned int bitscan_forward_uint(unsigned int a); + +/* Search the value from MSB to LSB for a set bit. Returns index of this bit. */ +MINLINE int bitscan_reverse_i(int a); +MINLINE unsigned int bitscan_reverse_uint(unsigned int a); + /* NOTE: Those functions returns 2 to the power of index of highest order bit. */ MINLINE unsigned int highest_order_bit_uint(unsigned int n); MINLINE unsigned short highest_order_bit_s(unsigned short n); |